indeed in liveview it works, all be it very slow and the target needs to have a fair bit of contrast.Anyway, from now on , I will carry a 12 mm extension tube, so I have the option to combine the extenders.

I tried this last night with my 70-200 f/2.8 IS II and it worked! The camera saw the setup as an f/5.6 lens and that allowed me to select all 61 AF points on my 5DIII. I was indoors at night so there was not a lot of light, so there was a problem locking focus, but I am not sure if that was because of trying to use 560mm of lens in my living room, or the low light. But the AF motor was searching! I will be trying this again outdoors this weekend and also with my new 300 f/2.8 IS II that I should be getting Thursday!

Very cool, but let me ask this: Is this combo getting you better results than just cropping? I'm not saying it is not, but that is the thing about a teleconverter, or combination of converters is it has to outperform just cropping the image.

If you shoot the moon with just the 2.0X and then crop, is there less less detail?

Very cool, but let me ask this: Is this combo getting you better results than just cropping? I'm not saying it is not, but that is the thing about a teleconverter, or combination of converters is it has to outperform just cropping the image.

If you shoot the moon with just the 2.0X and then crop, is there less less detail?

After reading the original post I gave it a try just for fun. And yes the results were really quite good and better than cropping.

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If you debate with a fool onlookers can find it VERY difficult to tell the difference.